(Leave empty for random seed, 1–4096)
A failing drive module may not output enough current to drive the motor at commanded speeds.
Note: The value is typically calculated based on the maximum feedrate, position loop gain (Parameter 1825), and detection units. The standard formula provided by FANUC guidelines is:
Note the value. If the value is set to something non-zero and your machine does not utilize an axis matrix, try setting it back to 0 (after backing up the current state).
Would you like a comparison table of Parameter 1829 across FANUC Series (0i, 30i, 31i, 18i) or a sample macro to test your current 1829 setting dynamically?
| Specification | Details | |---|---| | | 1829 | | Function | Positioning deviation limit for each axis in stopped state | | Data Type | Word (axis-specific) | | Unit of Data | Detection unit (typically 1 μm, depending on system configuration) | | Valid Data Range | 0 to 32,767 | | Related Alarms | SV0410, SV008, EXCESS ERROR (STOP) | fanuc parameter 1829
The gain value is too high for the current mechanical state of the machine (e.g., worn-out guideways or lack of lubrication).
When SV 0411 occurs, the issue is rarely a random software glitch. It indicates a physical or electrical deviation beyond the window allowed by Parameter 1829. Typical root causes include: 1. Mechanical Binding or Excessive Friction
To understand its function, you must first understand how a CNC machine moves. FANUC servo systems operate on multiple feedback loops: the current loop, the velocity (speed) loop, and the position loop.
To understand its purpose, it helps to break down how a FANUC servo system operates: A failing drive module may not output enough
When troubleshooting this alarm, it is important not to blindly increase the value of Parameter 1829. While this may stop the alarm, it masks the underlying mechanical or electrical issue. 1. Check for Physical Obstructions
Have you recently performed any on the affected axis?
Incorrectly configured motor initialization values or inadequate loop gain settings. How to View and Edit Parameter 1829
This is the most frequent alarm tied to Parameter 1829. The SV0417 alarm indicates that the digital servo parameters sent from the CNC to the servo amplifier are mathematically invalid. If the value is set to something non-zero
Thus, Parameter 1829 is not a simple “enable/disable” switch—it’s a .
The most direct consequence of exceeding Parameter 1829’s threshold is the generation of a servo alarm. Different FANUC control series use slightly different alarm nomenclature, but the underlying meaning is the same.
If expanding Parameter 1829 clears an alarm but uncovers a mechanical lubrication failure, always restore Parameter 1829 to its original OEM factory value after resolving the mechanical friction. Leaving it set too high risks severe mechanical damage during a true component failure.
In FANUC CNC systems (such as the 0i-D, 0i-F, 16i, 18i, 21i, and 30i/31i/32i series), defines the Position Loop Gain Deviation Limit During Movement (often referred to as the dynamic position deviation limit or moving positional deviation limit).
If the actual lag behind the commanded position exceeds the threshold value specified in Parameter 1829 while the axis is interpolating or traversing, the CNC control halts operation immediately to protect the machine from physical damage. Associated Alarms: SV 0411